[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.700908][ T26] audit: type=1800 audit(1571057351.319:25): pid=7093 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.747479][ T26] audit: type=1800 audit(1571057351.319:26): pid=7093 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.770908][ T26] audit: type=1800 audit(1571057351.319:27): pid=7093 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. 2019/10/14 12:49:19 fuzzer started 2019/10/14 12:49:21 dialing manager at 10.128.0.105:43961 2019/10/14 12:49:21 syscalls: 2523 2019/10/14 12:49:21 code coverage: enabled 2019/10/14 12:49:21 comparison tracing: enabled 2019/10/14 12:49:21 extra coverage: extra coverage is not supported by the kernel 2019/10/14 12:49:21 setuid sandbox: enabled 2019/10/14 12:49:21 namespace sandbox: enabled 2019/10/14 12:49:21 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 12:49:21 fault injection: enabled 2019/10/14 12:49:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 12:49:21 net packet injection: enabled 2019/10/14 12:49:21 net device setup: enabled 2019/10/14 12:49:21 concurrency sanitizer: enabled syzkaller login: [ 45.256917][ C0] ================================================================== [ 45.265160][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 45.274534][ C0] [ 45.277035][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 45.285933][ C0] tick_sched_do_timer+0x33/0xe0 [ 45.290885][ C0] tick_sched_timer+0x43/0xe0 [ 45.295553][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.300926][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.305856][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.311564][ C0] apic_timer_interrupt+0xf/0x20 [ 45.316554][ C0] __kcsan_check_watchpoint+0xa3/0x180 [ 45.322020][ C0] __tsan_read4+0x15/0x30 [ 45.326342][ C0] __netif_receive_skb_core+0x511/0x1a90 [ 45.331965][ C0] __netif_receive_skb_one_core+0x67/0xe0 [ 45.337681][ C0] __netif_receive_skb+0x37/0xf0 [ 45.342603][ C0] netif_receive_skb_internal+0x59/0x190 [ 45.348235][ C0] napi_gro_receive+0x28f/0x330 [ 45.353069][ C0] receive_buf+0x284/0x30b0 [ 45.357543][ C0] [ 45.359852][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 45.367467][ C0] tick_sched_do_timer+0xc0/0xe0 [ 45.372395][ C0] tick_sched_timer+0x43/0xe0 [ 45.377056][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.382281][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.387209][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.392824][ C0] apic_timer_interrupt+0xf/0x20 [ 45.397745][ C0] [ 45.400060][ C0] Reported by Kernel Concurrency Sanitizer on: [ 45.406193][ C0] CPU: 0 PID: 7259 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.414066][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.425183][ C0] ================================================================== [ 45.433324][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 45.439890][ C0] CPU: 0 PID: 7259 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.447069][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.457285][ C0] Call Trace: [ 45.460551][ C0] [ 45.463390][ C0] dump_stack+0xf5/0x159 [ 45.467700][ C0] panic+0x209/0x639 [ 45.471578][ C0] ? vprintk_func+0x8d/0x140 [ 45.476153][ C0] kcsan_report.cold+0xc/0x1b [ 45.480819][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.486343][ C0] __tsan_write4+0x32/0x40 [ 45.490745][ C0] tick_sched_do_timer+0xc0/0xe0 [ 45.495665][ C0] tick_sched_timer+0x43/0xe0 [ 45.500323][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.505602][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 45.510695][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.515621][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.521153][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 45.526775][ C0] apic_timer_interrupt+0xf/0x20 [ 45.531700][ C0] [ 45.534629][ C0] RIP: 0033:0x6098c3 [ 45.538522][ C0] Code: f9 e1 ff 0f 0b e8 dd f9 e1 ff 0f 0b e8 96 da e4 ff e9 11 fc ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 d5 00 00 00 <48> 83 ec 38 48 89 6c 24 30 48 8d 6c 24 30 48 8b 44 24 40 48 8b 08 [ 45.558116][ C0] RSP: 002b:000000c4204cfa38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 45.566572][ C0] RAX: 000000c4204a2028 RBX: 000000c4204a2000 RCX: 000000c420001c80 [ 45.574556][ C0] RDX: 000000000000000e RSI: 000000000000000c RDI: 000000000000003c [ 45.582598][ C0] RBP: 000000c4204cfa70 R08: 000000c4204a8000 R09: 0000000000000230 [ 45.590567][ C0] R10: 00000000ffffffff R11: 000000000000629c R12: 0000000000000040 [ 45.598607][ C0] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 45.608120][ C0] Kernel Offset: disabled [ 45.612461][ C0] Rebooting in 86400 seconds..